package reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import reggie.common.BaseContext;
import reggie.common.R;
import reggie.entity.ShoppingCart;
import reggie.service.ShoppingCartService;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;

@RestController
@RequestMapping("/shoppingCart")
@Slf4j
public class ShoppingCartController {

    @Autowired
    private ShoppingCartService shoppingCartService;


    /**
     * 查看购物车
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list() {



        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        queryWrapper.orderByDesc(ShoppingCart::getCreateTime);

        List<ShoppingCart> shoppingCarts = shoppingCartService.list(queryWrapper);

        return R.success(shoppingCarts);
    }

    /**
     * 添加购物车
     * @param shoppingCart
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart) {

        //设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        Long dishId = shoppingCart.getDishId();

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);

        //判断添加的是菜品还是套餐
        if (dishId != null) {
            //添加到购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        } else {
            //添加到购物车的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }

        //查询当前菜品或者套餐是否在购物车中
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);
        if (cartServiceOne != null) {
            //已经存在，则在原来数量上加一
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number + 1);
            shoppingCartService.updateById(cartServiceOne);
        } else {
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);

            //用于返回
            cartServiceOne = shoppingCart;
        }

        return R.success(cartServiceOne);

    }

    @PostMapping("/sub")
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart){

        //设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        Long dishId = shoppingCart.getDishId();

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);

        //判断添加的是菜品还是套餐
        if (dishId != null) {
            //添加到购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        } else {
            //添加到购物车的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }

        //查询当前菜品或者套餐是否在购物车中
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);
        if (cartServiceOne.getNumber() > 1) {
            //已经存在，则在原来数量上加一
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number - 1);
            shoppingCartService.updateById(cartServiceOne);
        } else {
            shoppingCartService.remove(queryWrapper);
            return R.error("不能再减少了");
        }

        return R.success(cartServiceOne);
    }

    /**
     * 清空购物车
     * @return
     */
    @DeleteMapping("/clean")
    public R<String> clean() {
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());

        shoppingCartService.remove(queryWrapper);
        return R.success("购物车已清空！");
    }
}
